Question about Brother MFC-8840D All-In-One Laser Printer

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Fuser Gear Md No. LJ 7416

Hi Guys.

I was given  this all-in -one unit, "if you can fix it, it's yours" senario. I've pulled appart the fuser and found two problems. The LJ 7416 gear has snaped in three places (need a new one) and the gear that drives this gear is slightly worn on the edges (will this need to be replaced?)

How much for the LJ 7416

Thanks for your time guys.


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Re: Fuser Gear Md No. LJ 7416

You will need to purchase these gears from a brother dealer but I warn against just changing the gears you mention, fuser driver gear in printer frame will be ok unless chipped, but usally the big gear on the fuser goes as does a little white one next to it, and these are breaking becase the fuser is hard to turn, if you just change the gear, the fault will reappear after a little use, best bet is to replace fuser assy (approx $150)

Posted on Oct 27, 2007

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From the Canon Service Manual:
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Your machine is in need of a new fuser unit. HP LaserJet 2400 Maintenance Kit Installation - Fuser (Part 1 of 2) Installing the fuser. Turn the power off and unplug the printer. Wait 20 minutes for the printer to cool.
Open the back door of the printer, using enough force that the door opens completely and the hinge locks disengage, as shown below.

2400_openbackdoor.jpg Remove the 2 screws circled in red below.

2400_removebackscrews.jpg Close the back door, and then flip the printer so that it rests on its face. 2400_closebackdoor.jpg 2400_flipprinter.jpg

Next swing open the paper guard which shields the back of Tray 2 when it is installed.


Looking inside the Tray 2 cavity, use a flatblade screwdriver to release the two tabs--one on each side of the rear cover.
2400_pryleft_backgate.jpg 2400_pryright_backgate.jpg

Next remove the rear cover from the printer by pulling down and away.


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Pry the grey DIMM cover loose and remove it.


Use a small flatblade screwdriver to disengage the tab on the connector shown below and unplug the connector.


Next (on the right hand side) remove the small black plastic cover, located near the green fuser gear, which hides the other fuser wires.
2400_removewirecover1.jpg 2400_removewirecover2.jpg

Then unplug the two connectors shown below and free the yellow/white wire from its guide clasp.


Now remove the four screws holding the fuser in place (shown below).


Now remove the black plastic piece shown below, the duplexer inlet guide. Gently pry the tabs on both ends loose and slide/rotate the guide back towards the fuser to release it.
2400_removeduplexguide2.jpg 2400_removeduplexguide3.jpg

Now you can remove the fuser, just pull it straight out towards you. Don't install the new fuser until you've replaced the main motor gear, as shown below.

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With the fuser removed, look into the printer and locate the main fuser drive gear on the left side of the fuser cavity (gear circled in red below).


Use a flathead screwdriver to pry the gear's release tab and remove the gear by sliding it off its metal bar.

2400_gearreleasetab.jpg 2400_removegear.jpg

Slide the new gear onto the metal bar--make sure the gear's release tab faces outwards so it will be accessible again--and lock the gear firmly in place.

Now repeat the fuser removal process backwards as you install the New Fuser:

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This is a difficult installation which should be done by a technician. Good luck with it !

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ACC C8057A 4100-mk-c4110a-mini.jpg Maintenance Kit, Fuser, 110V, LJ 4100 LJ 4100 Series ACC C8057-67901 4100-mk-c4110a-mini.jpg Maintenance Kit, Fuser, 110V, LJ 4100 LJ 4100 Series ACC C8058A 4100-mk-c4110a-mini.jpg Maintenance Kit, Fuser, 220V, LJ 4100 LJ 4100 Series
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Not such a easy job, you have been warned from one who knows OK

Good luck

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